Moisture separator reheater apparatus

Abstract

A moisture separator reheater apparatus having a shell member and a plurality of tube members situated therein with the shell member having a plurality of cycle steam inlets and a plurality of cycle steam outlets disposed on opposite sidewalls. The tube members are disposed longitudinally in the shell member and include an inlet pass and an outlet pass with the inlet pass receiving a heating fluid on its interior while being exposed to cool cycle steam on its exterior. The outlet pass is situated between the inlet pass and the cycle steam outlets, with the outlet pass receiving on its interior heating fluid which has previously flowed through the inlet pass while being exposed to heated cycle steam from the inlet pass on its exterior. All inlet passes receive heating fluid from a common source. A distributing manifold may be disposed within the shell adjacent the cycle steam inlets for distributing entering cycle steam transversely and longitudinally within the shell to a moisture separator structure which is situated between the distributing manifold and the inlet passes. The cycle steam may be heated in a plurality of stages by connecting the cycle steam outlets of one shell with the cycle steam inlets of a different shell and providing the inlet passes of each succeeding shell downstream from the first shell with heating fluid of increasing temperature.

I claim: 
     
       1. A steam reheating apparatus comprising: a first enclosed shell member;   a plurality of first cycle steam inlets arranged on one sidewall of said first shell;   a plurality of first cycle steam outlets arranged on an other sidewall of said first shell, said other sidewall being substantially oppositely situated from said one sidewall;   first means for reheating said cycle steam, said first reheating means extending longitudinally in said first shell between said first cycle steam inlets and said first cycle steam outlets;   a second shell member;   a plurality of second cycle steam inlets arranged on one sidewall of said shell, and disposed in fluid communication with said first steam cycle outlets in a series flow relation;   a plurality of second cycle steam outlets arranged on an other sidewall of said second shell, said other sidewall being substantially oppositely situated from said one sidewall;   second means for reheating said cycle steam, said second reheating means extending longitudinally in said second shell between said second cycle steam inlets and said second cycle steam outlets;   said first and second reheating means each including a plurality of heat exchange tubes grouped in a plurality of fluidly communicating tube passes wherein all successive tubeside fluid communicating passes are successively downstream from said respective cycle steam inlets, said tube passes including inlet and outlet passes in each shell, all said inlet pass tubes being in fluid communication with a heating fluid;   means for separating moisture from said cycle steam, said moisture separating means being disposed in said first enclosed shell between said first cycle steam inlets and said first reheating means; and   means for distributing cycle steam to said moisture separating means, said distributing means being disposed in said first enclosed shell between said moisture separating means and said first cycle steam inlets;   said tube passes being grouped in a plurality of tube bundles, each of which have an inlet in fluid communication with a source of heating fluid, the shell side of said bundles being in parallel flow relation with the fluid in said tubes to eliminate subcooling within said tubes.